noun 1. a problem or rejection which delays one's progress or which reverses some of the progress one has made; setback ⇒ The schedule has suffered a knockback., ⇒ It was hard work but I loved it, every success and every knock-back. 2. a rejection, esp when one has applied for a job or something similar ⇒ I must have made more than 100 phone calls and I didn't get a single knockback., ⇒ After that knock-back she worked briefly for the United Nations in Geneva.
3. prison slang failure to obtain parole ⇒ I received a two-year knock-back.
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